The file RDX\DesktopMgr\Blizzard.lua was missing - it is missing on github in all the latest commits. The call in the .toc file is there, but the file itself is missing. I downloaded the zip from wowi, extraced it to my addons folder, then copied over the latest commit (957d4d03b1 - fix error) from github and its working. But the Blizzard.lua is still missing on github.